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Restructuring and Other Initiatives (Details) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2016 USD ($) employees	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 753	$ 581	$ 1,051	$ 1,378	$ 1,378
Additions, interest accretion and other	47	305	163	184
Payments	(347)	(157)	(174)	(437)
Revisions to estimates and effect of foreign currency	(7)	24	10	(74)
Ending Balance	446	753	1,050	1,051	1,050
GMNA [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	367	143	438	459	459
Additions, interest accretion and other	1	241	65	9
Payments	(257)	(23)	(19)	(19)
Revisions to estimates and effect of foreign currency	0	6	1	(11)
Ending Balance	111	367	485	438	485
Temporary Layoff Benefits			353		353
GMNA [Member] | Cash Severance Incentive Programs [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other		240
GME [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	202	270	440	751	751
Additions, interest accretion and other	7	5	9	127
Payments	(51)	(85)	(73)	(385)
Revisions to estimates and effect of foreign currency	(2)	12	17	(53)
Ending Balance	156	202	393	440	393
GMIO [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	180	161	171	166	166
Additions, interest accretion and other	32	44	54	37
Payments	(32)	(31)	(53)	(22)
Revisions to estimates and effect of foreign currency	(6)	6	(8)	(10)
Ending Balance	174	180	164	171	164
GMIO [Member] | Separation Programs in Australia, Korea, India and Chevrolet Europe [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date	$ 770
Employees Affected, Inception to Date | employees	4,530
Restructuring and Related Cost, Expected Cost Remaining	$ 90
GMIO [Member] | Separation Programs in Australia, Korea, Thailand, Indonesia, and withdrawal of Chevrolet brand from Europe [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Cost Incurred to Date			605		605
GMSA [Member]
Restructuring Reserve [Roll Forward]
Beginning Balance	4	7	2	2	2
Additions, interest accretion and other	7	15	35	11
Payments	(7)	(18)	(29)	(11)
Revisions to estimates and effect of foreign currency	1	0	0	0
Ending Balance	$ 5	$ 4	$ 8	$ 2	8
GME and GMIO [Member] | Change in our business model in Russia [Member]
Restructuring Reserve [Roll Forward]
Additions, interest accretion and other					125
Pre-tax charges					$ 443

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